var tableToExcel = (function() {
    var uri = 'data:application/vnd.ms-excel;base64,',
        template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>',
        base64 = function(s) {
            return window.btoa(unescape(encodeURIComponent(s)))
        },
        format = function(s, c) {
            return s.replace(/{(\w+)}/g, function(m, p) {
                return c[p];
            })
        };
    return function(table, name, filename) {
        if (!table.nodeType) table = document.getElementById(table);
        console.log(table.innerHTML)
        var ctx = {
            worksheet: name || 'Worksheet',
            table: table.innerHTML
        } //此时的innerHTML数据可以自己自定义 比如json转化 只要值要数据符合即可

        document.getElementById("dlink").href = uri + base64(format(template, ctx));
        document.getElementById("dlink").download = filename;
        document.getElementById("dlink").click();
    }
});

var id = "tables",
    worksheetName = 'sheet',
    workName = "demo.xls";

document.getElementById('button').onclick = function() {
    var download = tableToExcel();
    download(id, worksheetName, workName)
};